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Texas Instruments ADS7229IPWRG4
- Part No.:
- ADS7229IPWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7229IPWRG4.pdf
- Description:
- IC ADC 12BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,741
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Product details
Overview
ADS7229IPWRG4 from Texas Instruments is a low-power, 12-bit, 1 MSPS successive approximation register (SAR) analog-to-digital converter with unipolar input range (0 V to VREF), SPI/DSP-compatible serial interface, and built-in conversion clock. It operates from 2.7 V to 5.5 V analog supply, delivers ±0.15 LSB typical INL, 73.9 dB SNR at 10 kHz, and supports daisy-chain mode for multi-ADC systems in industrial data acquisition.
For engineers reviewing the ADS7229IPWRG4 datasheet, ADS7229IPWRG4 pinout, ADS7229IPWRG4 application, or ADS7229IPWRG4 equivalent, key selection criteria include its 12-bit resolution with no missing codes, 1 MHz throughput at 3–5.5 V, integrated sample-and-hold, programmable EOC/INT polarity, and TSSOP-16 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The ADS7229IPWRG4 implements a capacitor-based SAR architecture with inherent sample-and-hold, supporting both manual (CONVST-triggered) and auto-triggered conversion modes. Its internal 21–24.5 MHz conversion clock eliminates external timing components, while the SPI-compatible serial interface supports up to 50 MHz SCLK and daisy-chain operation.
It features three power-down modes-deep power-down (1 µA), nap (0.5 µA), and auto-nap-with global CONVST independent of CS, and accepts unipolar differential inputs (+IN/–IN) referenced to an external voltage (0.3 V to +VA). The device uses separate analog (+VA) and digital I/O (+VBD) supplies for noise isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes - guarantees monotonicity and full code coverage for precision measurement. |
| Sampling Rate | 1 MSPS at +VA = 3–5.5 V; 900 kSPS at +VA = 2.7–3 V - enables high-speed acquisition without external clock dependency. |
| INL / DNL | ±0.15 LSB typ / ±0.12 LSB typ - ensures accurate linearity for sensor signal digitization in closed-loop control. |
| SNR / THD | 73.9 dB / –88.5 dB at fIN = 10 kHz - supports high-fidelity signal capture in transducer and medical instrumentation. |
| Power Dissipation | 13.7 mW at 1 MSPS, +VA = 3 V, +VBD = 1.8 V - enables battery-powered or thermally constrained embedded designs. |
| Reference Input | External unipolar reference (0.3 V to +VA) - allows flexible full-scale adjustment from 2.5 V to 5 V for varying sensor output ranges. |
| Operating Temp | –40°C to +85°C - qualified for industrial process control, motor drives, and automated test equipment environments. |
Pinout & Package
TSSOP-16 package (PW designation), 5.0 mm × 4.4 mm body, 0.65 mm pitch, exposed thermal pad not internally connected to substrate - requires PCB-level grounding per TI layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VA (Pin 1) | Analog supply | 2.7–5.5 V analog rail powering SAR core and reference buffer; decoupling critical for AC performance. |
| +VBD (Pin 16) | Digital I/O supply | 1.65–5.5 V logic rail for SCLK/SDI/SDO/FS/CS; enables level-shifting between analog and digital domains. |
| +IN (Pin 3) | Noninverting analog input | Differential input pair with –IN; accepts 0 V to VREF unipolar signals (e.g., bridge sensor outputs). |
| –IN (Pin 4) | Inverting analog input | Typically tied to AGND; defines common-mode point for differential sampling and CMRR optimization. |
| REF+ (Pin 7) | External reference positive | Accepts precision voltage reference (e.g., REF5025); sets full-scale range and directly impacts gain accuracy. |
| REF– (Pin 6) | Reference negative | Must connect to AGND via dedicated low-inductance path to minimize reference noise coupling. |
| CONVST (Pin 9) | Conversion start trigger | Edge-sensitive input freezing sample-and-hold; global across CS state - simplifies timing in multi-device systems. |
| EOC/INT/CDI (Pin 10) | Status/data I/O | Configurable as end-of-conversion flag, interrupt, or daisy-chain data input - enables flexible system synchronization. |
| FS/CS (Pin 11) | Frame sync / chip select | Active-low SPI slave select; also serves as frame sync for TMS320 DSP interfaces. |
| SCLK (Pin 15) | Serial clock input | Up to 50 MHz clock for SPI transfers; doubles as conversion clock when internal CCLK disabled. |
| SDI (Pin 12) | Serial data input | Accepts configuration commands (e.g., TAG bit, EOC polarity) and software reset instructions. |
| SDO (Pin 13) | Serial data output | Tri-state output delivering 12-bit straight-binary result MSB-first; supports daisy-chain readout. |
| AGND (Pin 5) | Analog ground | Primary return for analog circuitry; must be separated from BDGND to prevent digital noise injection. |
| BDGND (Pin 14) | Digital interface ground | Return for +VBD-supplied logic; isolated from AGND to maintain PSRR and SNR integrity. |
| NC (Pin 8) | No connection | Internally unconnected; must remain floating or grounded per PCB layout best practices. |
| RESERVED (Pin 2) | Internal function | TI-recommended tie to AGND or +VA; not user-accessible for signal routing or configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in conversion clock (CCLK) | 21–24.5 MHz internal oscillator eliminates need for external timing components and reduces BOM count. |
| Programmable EOC/INT polarity | Allows firmware to match active-high or active-low interrupt logic without external inverters or GPIO reassignment. |
| Daisy-chain mode support | Enables synchronous readout of multiple ADS7229IPWRG4 devices using single SCLK/SDI/SDO bus - saves MCU pins and simplifies firmware. |
| Global CONVST independent of CS | Permits simultaneous sampling across multiple converters even when individual CS lines are asserted at different times. |
| Three-tier power-down modes | Deep (1 µA), Nap (0.5 µA), and Auto-Nap (dynamic entry/exit) enable fine-grained energy management in portable or always-on systems. |
Applications
| Industrial Process Control | Medical Instrumentation |
|---|---|
Use Scenario: Monitoring pressure, flow, and temperature sensors in PLC analog input modules with 4–20 mA loop interfaces. IC Role / Device Role / Timing Role: Precision digitization of conditioned sensor outputs with 12-bit resolution and <±0.5 LSB INL error budget. Use Value: Enables sub-0.1% measurement accuracy over –40°C to +85°C, meeting IEC 61000-6-2 immunity requirements for factory-floor deployment. | Use Scenario: Digitizing ECG, EEG, and pulse oximeter front-end signals in portable diagnostic devices. IC Role / Device Role / Timing Role: High-SNR (73.9 dB) unipolar ADC capturing low-amplitude bio-potential waveforms at 1 MSPS. Use Value: Supports >10-bit effective resolution at 10 kHz, satisfying AAMI EC11 and IEC 60601-2-27 clinical accuracy thresholds. |
| Transducer Interface | Data Acquisition Systems |
Use Scenario: Interfacing strain gauges, RTDs, and LVDTs in structural health monitoring nodes powered by energy harvesting. IC Role / Device Role / Timing Role: Low-power (13.7 mW @ 1 MSPS) SAR ADC with deep power-down (1 µA) for duty-cycled sensing. Use Value: Extends battery life beyond 5 years in wireless sensor networks with 1-second sampling intervals. | Use Scenario: Modular DAQ chassis with hot-swappable ADC cards for lab and field testing of power electronics. IC Role / Device Role / Timing Role: Daisy-chain-capable ADC enabling synchronized multi-channel capture across 8+ cards via shared SPI bus. Use Value: Reduces inter-card skew to <5 ns and eliminates per-card clock distribution complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7229IPWR | Same silicon, identical electrical specs and pinout; G4 suffix denotes RoHS-compliant green packaging and enhanced moisture sensitivity level (MSL 2a). | No functional difference; suitable for all applications requiring ADS7229IPWRG4's performance and reliability. | Select ADS7229IPWRG4 when compliance with J-STD-020 MSL 2a and lead-free assembly is required. |
| ADS7279IRSAT | 14-bit, 500 kSPS, QFN-16; higher resolution but lower speed and no daisy-chain mode. | Better suited for static or slow-varying measurements (e.g., precision weight scales), not real-time control loops. | Choose ADS7279IRSAT only when 14-bit resolution outweighs need for 1 MSPS throughput and multi-device synchronization. |
Compared with ADS7229IPWR and ADS7279IRSAT, the ADS7229IPWRG4 provides identical performance to ADS7229IPWR with enhanced environmental compliance, while offering higher speed and daisy-chain capability than ADS7279IRSAT - making it optimal for time-critical, multi-node industrial DAQ systems.
Availability
ADS7229IPWRG4 is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, transducer interface, and data acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for ADS7229IPWRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal processing technologies.
The ADS7229IPWRG4 belongs to TI's precision SAR ADC product line, designed specifically for high-speed, low-power, industrial-grade data acquisition where accuracy, noise immunity, and system integration efficiency are critical.
FAQ
What is the maximum sampling rate of the ADS7229IPWRG4 under 3V analog supply?
The ADS7229IPWRG4 achieves 900 kSPS at +VA = 2.7–3.0 V and 1 MSPS at +VA = 3.0–5.5 V. This dual-rate behavior is specified in the Electrical Characteristics table for 2.7 V ≤ +VA ≤ 3.6 V conditions, with throughput dropping to 0.9 MHz below 3.0 V to maintain timing margins and AC performance.
Does the ADS7229IPWRG4 require an external reference voltage?
Yes, the ADS7229IPWRG4 requires an external reference applied between REF+ and REF– pins. It accepts 0.3 V to +VA, with typical use cases at 2.5 V or 5 V. The device does not include an internal reference; reference accuracy directly determines system gain error, which is ±0.002% FSR typical at 5 V.
Can the ADS7229IPWRG4 operate in daisy-chain mode with other ADCs?
Yes, the ADS7229IPWRG4 supports daisy-chain mode using the EOC/INT/CDI pin as chain data input and SDO as chain data output. Multiple devices share one SCLK and SDI line, with results read sequentially - confirmed in the Functional Block Diagram and Timing Characteristics sections of the SBAS437A datasheet.
What are the power-down current levels for the ADS7229IPWRG4?
The ADS7229IPWRG4 offers three power-down states: deep power-down draws 1 µA max, nap mode consumes 0.5 µA max, and auto-nap dynamically enters/exits nap based on conversion activity. These values are measured at VA = 3 V and are specified in the Power-Supply Requirements section of the datasheet.
Is the ADS7229IPWRG4 pin-compatible with the ADS7230 series?
No, the ADS7229IPWRG4 is not pin-compatible with the ADS7230. While both share the same TSSOP-16 package footprint, ADS7230 replaces –IN with COM and adds +IN0/+IN1 pins (requiring different pin assignments), and its RESERVED pin (Pin 12) functions as +IN1. Pin mapping differences are explicitly shown in the Terminal Functions tables for each device.
ADS7229IPWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 1.65V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7229IPWRG4 FAQ
1.How can I place an order for ADS7229IPWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7229IPWRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS7229IPWRG4 reliable?
The price and inventory of ADS7229IPWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7229IPWRG4 is usually 5 days.
3.What payment methods are accepted for ADS7229IPWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7229IPWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7229IPWRG4?
ADS7229IPWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7229IPWRG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS7229IPWRG4?
For technical support, including ADS7229IPWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7229IPWRG4 requirements.
6.How does Aetrix verify that ADS7229IPWRG4 is sourced from the original manufacturer or authorized distributors?
All ADS7229IPWRG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS7229IPWRG4 meets industry standards.
7.What is the process for return or replacement of ADS7229IPWRG4?
All ADS7229IPWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7229IPWRG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS7229IPWRG4 part is unused and in its original packaging.
Return procedure for ADS7229IPWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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